Canteen.



PATENTED DEC. 3, 1907.

H. J. DONAHOB.

CANTEEN.

APPLICATION FILED 00121, 1904.

NN MN I W IIEDLEY J. DONAHOE, OF CHICAGO, ILLINOIS.

CANTEEN.

Specification of Letters Patent.

Patented Dec. 3, 1907'.

Application filed October 1. 1904. Serial No. 226.744.

that class of canteens provided with filters so constructed and arranged that the user drinks from the open end of the filter tube which is inserted into the body of the canteen, the filtering action being accelerated by the partial vacuum created in the tube by drawing the li uidfrom one end thereof.

In devices of this character it is essential to invert the canteen or vessel in the act of drinking from the mouth piece of the filter and it is also necessary that means be provided whereby air can enter the canteen as rapidly as the liquid is withdrawn. Heretofore an air vent has been provided with an outlet at or near the mouth piece for the admission of air to the interior of the canteen when it is inverted, and in order that the bulk of the liquid may not discharge through this vent, it has heretofore been proposed to extend a tube from the outlet of the vent to a point at or near the bottom of the canteen so that the end of the tube will be above the level of the liquid when the canteen is inverted in the act of drinking therefrom. For obvious reasons this tube must be of more than capillary size and consequently it holds a material-amount of the liquid when the canteen is inverted and this amount, whatever it be, discharges through the outlet of'the vent on to the chin or face of the user and creates an objectionable and disagreeable sensation. In many instances also it is found that should the user fail to tip the canteen high enough to bring the end of the tube above the level of the liquid there will be a direct discharge from the body of the canteen through the tube which will continue as long as the end of the tube is held thus submerged.

My invention has for its primary object therefore to provide an improved and simple construction of canteen filter in which these objectionable features will be entirely obviated and the air vent will open automatically to admit the air as fast as the liquid is drawn out and will close against the discharge of the liquid therethrough.

With these ends in view my invention consists in certain features of novelty in the construction, combination and arrangement of parts by which the said object and certain other objects hereinafter appearing are attained, all as fully described with reference to the accompanying drawings and more particularly pointed out in the claims.

In the said dra\vingsFigure 1 is a side elevation of my improved canteen partly broken away and partly sectioned. Fig. 2 is an edge view thereof with the filter removed, and Fig. 3 is a vertical, sectional view of the filter and mouth piece.

1 is the body of the canteen or any other suitable vessel, which is preferably made cylindrical, and provided with a foot piece 2 consisting of a piece of bent metal secured at its midlength by a rivet or other means 3, and also at its extremities by similar means 4 to the bottom of the canteen so as to form a support without constituting an objectionable projection. The body at the top is provided with a neck 5, which is pressed into the form of a female screw for receiving a screw threaded plug 6 secured or formed on the lower end of a body 7 whose upper end is formed with a mouth piece 8. The

plug 6 is preferably made of thin sheet metal like the neck 5 and it is firmly clamped between a washer 9 and a gasket 10, by means of a tube 11 whose upper end is screw threaded in the body 7 while its lower end is provided with a nut 12 which serves to clamp a washer 13 and gasket 14 against the lower end of a filter tube 15, the upper end. of the tube 15 serving as a direct support for the washer 9. Thus by tightening the nut 12 the three parts, namely, the body with the mouth piece, the plug 6 and the tube 15 are firmly clamped together on the tube 11. The tube 11 is considerably smaller in diameter than the interior of the tube 15 so as to leave a filtered water chamber 16 and such tube 11 is also formed at short intervals with perforations 17 whereby the filtered water may enter it and be drawn therefrom at the mouth piece 8 through a central discharge passage 18 which may be closed when not in use by a suitable cap 19.

The lower face of the body portion 7 is formed with an annular channel 20 and from this channel at one side of the body extends an air vent 21 which communicates with the atmosphere through the upper part of the body and is preferably so situated that its outer end will be closed when the cap 19 is in place At the lower end of this air vent 21 is formed a valve chamber 22 and in this is situated a glass ball 23 or other suit able valve, which falls into place and closes the vent 21 when the filter is inverted, but when the internal pressure becomes less than that of the external atmosphere it automatically lifts from its seat over the end of the vent 21 and permits the air to enter the channel 20, which is sufficiently large to form a clearance around the valve 23 when the valve lifts from its seat but is not large enough to receive the valve entire. The channel 20 at some convenient point, preferably on the opposite side of the body 7, is connected with the interior of the canteen by any suitable means such as a small tube 24, which has its upper end secured in and passing through the gasket 10 and its lower end secured in and passing through the washer 9 on the outside of the tube 15, the tube 24 passing through the hollow plug 6 and thus placing the body 1 of the canteen in communication with the duct or vent 21 when the valve 23 is unseated.

With a canteen filter thus constructed it will be seen that the contents may be drawn from the tubes 11 and 15 at will and the filtering of the liquid through the filter tube 15 accelerated by inverting the canteen and sucking at the mouth piece 8, and as the liquid discharges the valve 23 rises from its seat, permitting the air to enter the vent 21 and although the small tube 24 and the channel 20 may be filled with liquid at the time,

. the inrushing air will clear this passage of the liquid by forcing it upwardly back into the body of the canteen and as soon as the sucking action ceases the valve will automatically close before the liquid has an opportunity to reach and discharge through the vent 21. In other words when the canteen receptacle is inverted, the Valve seats by gravity, the liquidin the vent passage remains and the suction at the mouth piece soon causes a sufficient discharge of liquid from the receptacle to produce a vacuum enabling air at atmospheric pressure to overcome both the gravity of the valve and the weight of the column of liquid in the Vent passage and lift the liquid in the vent passage and above the same until it is discharged in its entirety into the receptacle. i

So long as the receptacle is retained in its inverted osition, the valve will be maintained Off its seat until the vacuum is destroyed, when it will again seat by gravity and remain seated until the conditions as to vacuum and air pressure again seat it.

The reseating of the valve will occur simultaneously with the return flow of liquid into the vent passage, and although the liquid will eventually fill the vent passage, none of the liquid will reach the valve until after the valve is seated and as a result no liquid can possibly pass the valve and discharge upon the user or be wasted.

Having thus described my invention what I claim as new therein and desire to secure by Letters Patent, is:

1. A canteen structure comprising in combination a liquid receptacle, a filter and a mouth piece provided with an internal passage, an air vent passage, the inner end of which terminates substantially above the inner end of the filter, and a check valve in said passage at a point removed from the inner end thereof.

2. A canteen structure comprising in combination a liquid receptacle, a filter, and a mouth piece, provided with an internal passage, an air vent passage for said receptacle, and a valve located in said air vent passage adjacent the outer end thereof, automatically operating to admit air to the receptacle and prevent a liquid discharge therefrom through said air ventpassagej I 3. A canteen structure comprising in combination a liquid receptacle, a filter, and a mouth piece, provided with an internal normally submerged passage, an air vent passage for said receptacle, and a valve located in said air vent passage adjacent the outer end thereof, automatically operatingv to admit air to the receptacle and prevent a liquid discharge therefrom through said air vent passage.

HEDLEY J. DONAHOE.

Witnesses:

F. A. HOPKINS, M. B. ALLsTADT. 

